code: def __init__(self):
      self._charts: list = []
  
file_path: pyecharts/test/test_mixins.py
imports: from unittest.mock import patch
  from nose.tools import assert_equal
  from pyecharts import options
  from pyecharts.charts import Bar, Line
  from pyecharts.charts.mixins import CompositeMixin
label_desc: Use image node_id 1 to create a new CustomCompositeChart object from inherited base classes: CompositeMixin with example: obj = CustomCompositeChart()